1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * IUCV protocol stack for Linux on zSeries 4 * 5 * Copyright IBM Corp. 2006, 2009 6 * 7 * Author(s): Jennifer Hunt <jenhunt@us.ibm.com> 8 * Hendrik Brueckner <brueckner@linux.vnet.ibm.com> 9 * PM functions: 10 * Ursula Braun <ursula.braun@de.ibm.com> 11 */ 12 13 #define KMSG_COMPONENT "af_iucv" 14 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt 15 16 #include <linux/module.h> 17 #include <linux/types.h> 18 #include <linux/list.h> 19 #include <linux/errno.h> 20 #include <linux/kernel.h> 21 #include <linux/sched/signal.h> 22 #include <linux/slab.h> 23 #include <linux/skbuff.h> 24 #include <linux/init.h> 25 #include <linux/poll.h> 26 #include <linux/security.h> 27 #include <net/sock.h> 28 #include <asm/ebcdic.h> 29 #include <asm/cpcmd.h> 30 #include <linux/kmod.h> 31 32 #include <net/iucv/af_iucv.h> 33 34 #define VERSION "1.2" 35 36 static char iucv_userid[80]; 37 38 static const struct proto_ops iucv_sock_ops; 39 40 static struct proto iucv_proto = { 41 .name = "AF_IUCV", 42 .owner = THIS_MODULE, 43 .obj_size = sizeof(struct iucv_sock), 44 }; 45 46 static struct iucv_interface *pr_iucv; 47 48 /* special AF_IUCV IPRM messages */ 49 static const u8 iprm_shutdown[8] = 50 {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01}; 51 52 #define TRGCLS_SIZE FIELD_SIZEOF(struct iucv_message, class) 53 54 #define __iucv_sock_wait(sk, condition, timeo, ret) \ 55 do { \ 56 DEFINE_WAIT(__wait); \ 57 long __timeo = timeo; \ 58 ret = 0; \ 59 prepare_to_wait(sk_sleep(sk), &__wait, TASK_INTERRUPTIBLE); \ 60 while (!(condition)) { \ 61 if (!__timeo) { \ 62 ret = -EAGAIN; \ 63 break; \ 64 } \ 65 if (signal_pending(current)) { \ 66 ret = sock_intr_errno(__timeo); \ 67 break; \ 68 } \ 69 release_sock(sk); \ 70 __timeo = schedule_timeout(__timeo); \ 71 lock_sock(sk); \ 72 ret = sock_error(sk); \ 73 if (ret) \ 74 break; \ 75 } \ 76 finish_wait(sk_sleep(sk), &__wait); \ 77 } while (0) 78 79 #define iucv_sock_wait(sk, condition, timeo) \ 80 ({ \ 81 int __ret = 0; \ 82 if (!(condition)) \ 83 __iucv_sock_wait(sk, condition, timeo, __ret); \ 84 __ret; \ 85 }) 86 87 static void iucv_sock_kill(struct sock *sk); 88 static void iucv_sock_close(struct sock *sk); 89 static void iucv_sever_path(struct sock *, int); 90 91 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, 92 struct packet_type *pt, struct net_device *orig_dev); 93 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, 94 struct sk_buff *skb, u8 flags); 95 static void afiucv_hs_callback_txnotify(struct sk_buff *, enum iucv_tx_notify); 96 97 /* Call Back functions */ 98 static void iucv_callback_rx(struct iucv_path *, struct iucv_message *); 99 static void iucv_callback_txdone(struct iucv_path *, struct iucv_message *); 100 static void iucv_callback_connack(struct iucv_path *, u8 *); 101 static int iucv_callback_connreq(struct iucv_path *, u8 *, u8 *); 102 static void iucv_callback_connrej(struct iucv_path *, u8 *); 103 static void iucv_callback_shutdown(struct iucv_path *, u8 *); 104 105 static struct iucv_sock_list iucv_sk_list = { 106 .lock = __RW_LOCK_UNLOCKED(iucv_sk_list.lock), 107 .autobind_name = ATOMIC_INIT(0) 108 }; 109 110 static struct iucv_handler af_iucv_handler = { 111 .path_pending = iucv_callback_connreq, 112 .path_complete = iucv_callback_connack, 113 .path_severed = iucv_callback_connrej, 114 .message_pending = iucv_callback_rx, 115 .message_complete = iucv_callback_txdone, 116 .path_quiesced = iucv_callback_shutdown, 117 }; 118 119 static inline void high_nmcpy(unsigned char *dst, char *src) 120 { 121 memcpy(dst, src, 8); 122 } 123 124 static inline void low_nmcpy(unsigned char *dst, char *src) 125 { 126 memcpy(&dst[8], src, 8); 127 } 128 129 static int afiucv_pm_prepare(struct device *dev) 130 { 131 #ifdef CONFIG_PM_DEBUG 132 printk(KERN_WARNING "afiucv_pm_prepare\n"); 133 #endif 134 return 0; 135 } 136 137 static void afiucv_pm_complete(struct device *dev) 138 { 139 #ifdef CONFIG_PM_DEBUG 140 printk(KERN_WARNING "afiucv_pm_complete\n"); 141 #endif 142 } 143 144 /** 145 * afiucv_pm_freeze() - Freeze PM callback 146 * @dev: AFIUCV dummy device 147 * 148 * Sever all established IUCV communication pathes 149 */ 150 static int afiucv_pm_freeze(struct device *dev) 151 { 152 struct iucv_sock *iucv; 153 struct sock *sk; 154 155 #ifdef CONFIG_PM_DEBUG 156 printk(KERN_WARNING "afiucv_pm_freeze\n"); 157 #endif 158 read_lock(&iucv_sk_list.lock); 159 sk_for_each(sk, &iucv_sk_list.head) { 160 iucv = iucv_sk(sk); 161 switch (sk->sk_state) { 162 case IUCV_DISCONN: 163 case IUCV_CLOSING: 164 case IUCV_CONNECTED: 165 iucv_sever_path(sk, 0); 166 break; 167 case IUCV_OPEN: 168 case IUCV_BOUND: 169 case IUCV_LISTEN: 170 case IUCV_CLOSED: 171 default: 172 break; 173 } 174 skb_queue_purge(&iucv->send_skb_q); 175 skb_queue_purge(&iucv->backlog_skb_q); 176 } 177 read_unlock(&iucv_sk_list.lock); 178 return 0; 179 } 180 181 /** 182 * afiucv_pm_restore_thaw() - Thaw and restore PM callback 183 * @dev: AFIUCV dummy device 184 * 185 * socket clean up after freeze 186 */ 187 static int afiucv_pm_restore_thaw(struct device *dev) 188 { 189 struct sock *sk; 190 191 #ifdef CONFIG_PM_DEBUG 192 printk(KERN_WARNING "afiucv_pm_restore_thaw\n"); 193 #endif 194 read_lock(&iucv_sk_list.lock); 195 sk_for_each(sk, &iucv_sk_list.head) { 196 switch (sk->sk_state) { 197 case IUCV_CONNECTED: 198 sk->sk_err = EPIPE; 199 sk->sk_state = IUCV_DISCONN; 200 sk->sk_state_change(sk); 201 break; 202 case IUCV_DISCONN: 203 case IUCV_CLOSING: 204 case IUCV_LISTEN: 205 case IUCV_BOUND: 206 case IUCV_OPEN: 207 default: 208 break; 209 } 210 } 211 read_unlock(&iucv_sk_list.lock); 212 return 0; 213 } 214 215 static const struct dev_pm_ops afiucv_pm_ops = { 216 .prepare = afiucv_pm_prepare, 217 .complete = afiucv_pm_complete, 218 .freeze = afiucv_pm_freeze, 219 .thaw = afiucv_pm_restore_thaw, 220 .restore = afiucv_pm_restore_thaw, 221 }; 222 223 static struct device_driver af_iucv_driver = { 224 .owner = THIS_MODULE, 225 .name = "afiucv", 226 .bus = NULL, 227 .pm = &afiucv_pm_ops, 228 }; 229 230 /* dummy device used as trigger for PM functions */ 231 static struct device *af_iucv_dev; 232 233 /** 234 * iucv_msg_length() - Returns the length of an iucv message. 235 * @msg: Pointer to struct iucv_message, MUST NOT be NULL 236 * 237 * The function returns the length of the specified iucv message @msg of data 238 * stored in a buffer and of data stored in the parameter list (PRMDATA). 239 * 240 * For IUCV_IPRMDATA, AF_IUCV uses the following convention to transport socket 241 * data: 242 * PRMDATA[0..6] socket data (max 7 bytes); 243 * PRMDATA[7] socket data length value (len is 0xff - PRMDATA[7]) 244 * 245 * The socket data length is computed by subtracting the socket data length 246 * value from 0xFF. 247 * If the socket data len is greater 7, then PRMDATA can be used for special 248 * notifications (see iucv_sock_shutdown); and further, 249 * if the socket data len is > 7, the function returns 8. 250 * 251 * Use this function to allocate socket buffers to store iucv message data. 252 */ 253 static inline size_t iucv_msg_length(struct iucv_message *msg) 254 { 255 size_t datalen; 256 257 if (msg->flags & IUCV_IPRMDATA) { 258 datalen = 0xff - msg->rmmsg[7]; 259 return (datalen < 8) ? datalen : 8; 260 } 261 return msg->length; 262 } 263 264 /** 265 * iucv_sock_in_state() - check for specific states 266 * @sk: sock structure 267 * @state: first iucv sk state 268 * @state: second iucv sk state 269 * 270 * Returns true if the socket in either in the first or second state. 271 */ 272 static int iucv_sock_in_state(struct sock *sk, int state, int state2) 273 { 274 return (sk->sk_state == state || sk->sk_state == state2); 275 } 276 277 /** 278 * iucv_below_msglim() - function to check if messages can be sent 279 * @sk: sock structure 280 * 281 * Returns true if the send queue length is lower than the message limit. 282 * Always returns true if the socket is not connected (no iucv path for 283 * checking the message limit). 284 */ 285 static inline int iucv_below_msglim(struct sock *sk) 286 { 287 struct iucv_sock *iucv = iucv_sk(sk); 288 289 if (sk->sk_state != IUCV_CONNECTED) 290 return 1; 291 if (iucv->transport == AF_IUCV_TRANS_IUCV) 292 return (skb_queue_len(&iucv->send_skb_q) < iucv->path->msglim); 293 else 294 return ((atomic_read(&iucv->msg_sent) < iucv->msglimit_peer) && 295 (atomic_read(&iucv->pendings) <= 0)); 296 } 297 298 /** 299 * iucv_sock_wake_msglim() - Wake up thread waiting on msg limit 300 */ 301 static void iucv_sock_wake_msglim(struct sock *sk) 302 { 303 struct socket_wq *wq; 304 305 rcu_read_lock(); 306 wq = rcu_dereference(sk->sk_wq); 307 if (skwq_has_sleeper(wq)) 308 wake_up_interruptible_all(&wq->wait); 309 sk_wake_async(sk, SOCK_WAKE_SPACE, POLL_OUT); 310 rcu_read_unlock(); 311 } 312 313 /** 314 * afiucv_hs_send() - send a message through HiperSockets transport 315 */ 316 static int afiucv_hs_send(struct iucv_message *imsg, struct sock *sock, 317 struct sk_buff *skb, u8 flags) 318 { 319 struct iucv_sock *iucv = iucv_sk(sock); 320 struct af_iucv_trans_hdr *phs_hdr; 321 struct sk_buff *nskb; 322 int err, confirm_recv = 0; 323 324 phs_hdr = skb_push(skb, sizeof(*phs_hdr)); 325 memset(phs_hdr, 0, sizeof(*phs_hdr)); 326 skb_reset_network_header(skb); 327 328 phs_hdr->magic = ETH_P_AF_IUCV; 329 phs_hdr->version = 1; 330 phs_hdr->flags = flags; 331 if (flags == AF_IUCV_FLAG_SYN) 332 phs_hdr->window = iucv->msglimit; 333 else if ((flags == AF_IUCV_FLAG_WIN) || !flags) { 334 confirm_recv = atomic_read(&iucv->msg_recv); 335 phs_hdr->window = confirm_recv; 336 if (confirm_recv) 337 phs_hdr->flags = phs_hdr->flags | AF_IUCV_FLAG_WIN; 338 } 339 memcpy(phs_hdr->destUserID, iucv->dst_user_id, 8); 340 memcpy(phs_hdr->destAppName, iucv->dst_name, 8); 341 memcpy(phs_hdr->srcUserID, iucv->src_user_id, 8); 342 memcpy(phs_hdr->srcAppName, iucv->src_name, 8); 343 ASCEBC(phs_hdr->destUserID, sizeof(phs_hdr->destUserID)); 344 ASCEBC(phs_hdr->destAppName, sizeof(phs_hdr->destAppName)); 345 ASCEBC(phs_hdr->srcUserID, sizeof(phs_hdr->srcUserID)); 346 ASCEBC(phs_hdr->srcAppName, sizeof(phs_hdr->srcAppName)); 347 if (imsg) 348 memcpy(&phs_hdr->iucv_hdr, imsg, sizeof(struct iucv_message)); 349 350 skb_push(skb, ETH_HLEN); 351 memset(skb->data, 0, ETH_HLEN); 352 353 skb->dev = iucv->hs_dev; 354 if (!skb->dev) { 355 err = -ENODEV; 356 goto err_free; 357 } 358 if (!(skb->dev->flags & IFF_UP) || !netif_carrier_ok(skb->dev)) { 359 err = -ENETDOWN; 360 goto err_free; 361 } 362 if (skb->len > skb->dev->mtu) { 363 if (sock->sk_type == SOCK_SEQPACKET) { 364 err = -EMSGSIZE; 365 goto err_free; 366 } 367 skb_trim(skb, skb->dev->mtu); 368 } 369 skb->protocol = cpu_to_be16(ETH_P_AF_IUCV); 370 nskb = skb_clone(skb, GFP_ATOMIC); 371 if (!nskb) { 372 err = -ENOMEM; 373 goto err_free; 374 } 375 376 skb_queue_tail(&iucv->send_skb_q, nskb); 377 err = dev_queue_xmit(skb); 378 if (net_xmit_eval(err)) { 379 skb_unlink(nskb, &iucv->send_skb_q); 380 kfree_skb(nskb); 381 } else { 382 atomic_sub(confirm_recv, &iucv->msg_recv); 383 WARN_ON(atomic_read(&iucv->msg_recv) < 0); 384 } 385 return net_xmit_eval(err); 386 387 err_free: 388 kfree_skb(skb); 389 return err; 390 } 391 392 static struct sock *__iucv_get_sock_by_name(char *nm) 393 { 394 struct sock *sk; 395 396 sk_for_each(sk, &iucv_sk_list.head) 397 if (!memcmp(&iucv_sk(sk)->src_name, nm, 8)) 398 return sk; 399 400 return NULL; 401 } 402 403 static void iucv_sock_destruct(struct sock *sk) 404 { 405 skb_queue_purge(&sk->sk_receive_queue); 406 skb_queue_purge(&sk->sk_error_queue); 407 408 sk_mem_reclaim(sk); 409 410 if (!sock_flag(sk, SOCK_DEAD)) { 411 pr_err("Attempt to release alive iucv socket %p\n", sk); 412 return; 413 } 414 415 WARN_ON(atomic_read(&sk->sk_rmem_alloc)); 416 WARN_ON(refcount_read(&sk->sk_wmem_alloc)); 417 WARN_ON(sk->sk_wmem_queued); 418 WARN_ON(sk->sk_forward_alloc); 419 } 420 421 /* Cleanup Listen */ 422 static void iucv_sock_cleanup_listen(struct sock *parent) 423 { 424 struct sock *sk; 425 426 /* Close non-accepted connections */ 427 while ((sk = iucv_accept_dequeue(parent, NULL))) { 428 iucv_sock_close(sk); 429 iucv_sock_kill(sk); 430 } 431 432 parent->sk_state = IUCV_CLOSED; 433 } 434 435 /* Kill socket (only if zapped and orphaned) */ 436 static void iucv_sock_kill(struct sock *sk) 437 { 438 if (!sock_flag(sk, SOCK_ZAPPED) || sk->sk_socket) 439 return; 440 441 iucv_sock_unlink(&iucv_sk_list, sk); 442 sock_set_flag(sk, SOCK_DEAD); 443 sock_put(sk); 444 } 445 446 /* Terminate an IUCV path */ 447 static void iucv_sever_path(struct sock *sk, int with_user_data) 448 { 449 unsigned char user_data[16]; 450 struct iucv_sock *iucv = iucv_sk(sk); 451 struct iucv_path *path = iucv->path; 452 453 if (iucv->path) { 454 iucv->path = NULL; 455 if (with_user_data) { 456 low_nmcpy(user_data, iucv->src_name); 457 high_nmcpy(user_data, iucv->dst_name); 458 ASCEBC(user_data, sizeof(user_data)); 459 pr_iucv->path_sever(path, user_data); 460 } else 461 pr_iucv->path_sever(path, NULL); 462 iucv_path_free(path); 463 } 464 } 465 466 /* Send controlling flags through an IUCV socket for HIPER transport */ 467 static int iucv_send_ctrl(struct sock *sk, u8 flags) 468 { 469 int err = 0; 470 int blen; 471 struct sk_buff *skb; 472 u8 shutdown = 0; 473 474 blen = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN; 475 if (sk->sk_shutdown & SEND_SHUTDOWN) { 476 /* controlling flags should be sent anyway */ 477 shutdown = sk->sk_shutdown; 478 sk->sk_shutdown &= RCV_SHUTDOWN; 479 } 480 skb = sock_alloc_send_skb(sk, blen, 1, &err); 481 if (skb) { 482 skb_reserve(skb, blen); 483 err = afiucv_hs_send(NULL, sk, skb, flags); 484 } 485 if (shutdown) 486 sk->sk_shutdown = shutdown; 487 return err; 488 } 489 490 /* Close an IUCV socket */ 491 static void iucv_sock_close(struct sock *sk) 492 { 493 struct iucv_sock *iucv = iucv_sk(sk); 494 unsigned long timeo; 495 int err = 0; 496 497 lock_sock(sk); 498 499 switch (sk->sk_state) { 500 case IUCV_LISTEN: 501 iucv_sock_cleanup_listen(sk); 502 break; 503 504 case IUCV_CONNECTED: 505 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 506 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); 507 sk->sk_state = IUCV_DISCONN; 508 sk->sk_state_change(sk); 509 } 510 case IUCV_DISCONN: /* fall through */ 511 sk->sk_state = IUCV_CLOSING; 512 sk->sk_state_change(sk); 513 514 if (!err && !skb_queue_empty(&iucv->send_skb_q)) { 515 if (sock_flag(sk, SOCK_LINGER) && sk->sk_lingertime) 516 timeo = sk->sk_lingertime; 517 else 518 timeo = IUCV_DISCONN_TIMEOUT; 519 iucv_sock_wait(sk, 520 iucv_sock_in_state(sk, IUCV_CLOSED, 0), 521 timeo); 522 } 523 524 case IUCV_CLOSING: /* fall through */ 525 sk->sk_state = IUCV_CLOSED; 526 sk->sk_state_change(sk); 527 528 sk->sk_err = ECONNRESET; 529 sk->sk_state_change(sk); 530 531 skb_queue_purge(&iucv->send_skb_q); 532 skb_queue_purge(&iucv->backlog_skb_q); 533 534 default: /* fall through */ 535 iucv_sever_path(sk, 1); 536 } 537 538 if (iucv->hs_dev) { 539 dev_put(iucv->hs_dev); 540 iucv->hs_dev = NULL; 541 sk->sk_bound_dev_if = 0; 542 } 543 544 /* mark socket for deletion by iucv_sock_kill() */ 545 sock_set_flag(sk, SOCK_ZAPPED); 546 547 release_sock(sk); 548 } 549 550 static void iucv_sock_init(struct sock *sk, struct sock *parent) 551 { 552 if (parent) { 553 sk->sk_type = parent->sk_type; 554 security_sk_clone(parent, sk); 555 } 556 } 557 558 static struct sock *iucv_sock_alloc(struct socket *sock, int proto, gfp_t prio, int kern) 559 { 560 struct sock *sk; 561 struct iucv_sock *iucv; 562 563 sk = sk_alloc(&init_net, PF_IUCV, prio, &iucv_proto, kern); 564 if (!sk) 565 return NULL; 566 iucv = iucv_sk(sk); 567 568 sock_init_data(sock, sk); 569 INIT_LIST_HEAD(&iucv->accept_q); 570 spin_lock_init(&iucv->accept_q_lock); 571 skb_queue_head_init(&iucv->send_skb_q); 572 INIT_LIST_HEAD(&iucv->message_q.list); 573 spin_lock_init(&iucv->message_q.lock); 574 skb_queue_head_init(&iucv->backlog_skb_q); 575 iucv->send_tag = 0; 576 atomic_set(&iucv->pendings, 0); 577 iucv->flags = 0; 578 iucv->msglimit = 0; 579 atomic_set(&iucv->msg_sent, 0); 580 atomic_set(&iucv->msg_recv, 0); 581 iucv->path = NULL; 582 iucv->sk_txnotify = afiucv_hs_callback_txnotify; 583 memset(&iucv->src_user_id , 0, 32); 584 if (pr_iucv) 585 iucv->transport = AF_IUCV_TRANS_IUCV; 586 else 587 iucv->transport = AF_IUCV_TRANS_HIPER; 588 589 sk->sk_destruct = iucv_sock_destruct; 590 sk->sk_sndtimeo = IUCV_CONN_TIMEOUT; 591 sk->sk_allocation = GFP_DMA; 592 593 sock_reset_flag(sk, SOCK_ZAPPED); 594 595 sk->sk_protocol = proto; 596 sk->sk_state = IUCV_OPEN; 597 598 iucv_sock_link(&iucv_sk_list, sk); 599 return sk; 600 } 601 602 /* Create an IUCV socket */ 603 static int iucv_sock_create(struct net *net, struct socket *sock, int protocol, 604 int kern) 605 { 606 struct sock *sk; 607 608 if (protocol && protocol != PF_IUCV) 609 return -EPROTONOSUPPORT; 610 611 sock->state = SS_UNCONNECTED; 612 613 switch (sock->type) { 614 case SOCK_STREAM: 615 sock->ops = &iucv_sock_ops; 616 break; 617 case SOCK_SEQPACKET: 618 /* currently, proto ops can handle both sk types */ 619 sock->ops = &iucv_sock_ops; 620 break; 621 default: 622 return -ESOCKTNOSUPPORT; 623 } 624 625 sk = iucv_sock_alloc(sock, protocol, GFP_KERNEL, kern); 626 if (!sk) 627 return -ENOMEM; 628 629 iucv_sock_init(sk, NULL); 630 631 return 0; 632 } 633 634 void iucv_sock_link(struct iucv_sock_list *l, struct sock *sk) 635 { 636 write_lock_bh(&l->lock); 637 sk_add_node(sk, &l->head); 638 write_unlock_bh(&l->lock); 639 } 640 641 void iucv_sock_unlink(struct iucv_sock_list *l, struct sock *sk) 642 { 643 write_lock_bh(&l->lock); 644 sk_del_node_init(sk); 645 write_unlock_bh(&l->lock); 646 } 647 648 void iucv_accept_enqueue(struct sock *parent, struct sock *sk) 649 { 650 unsigned long flags; 651 struct iucv_sock *par = iucv_sk(parent); 652 653 sock_hold(sk); 654 spin_lock_irqsave(&par->accept_q_lock, flags); 655 list_add_tail(&iucv_sk(sk)->accept_q, &par->accept_q); 656 spin_unlock_irqrestore(&par->accept_q_lock, flags); 657 iucv_sk(sk)->parent = parent; 658 sk_acceptq_added(parent); 659 } 660 661 void iucv_accept_unlink(struct sock *sk) 662 { 663 unsigned long flags; 664 struct iucv_sock *par = iucv_sk(iucv_sk(sk)->parent); 665 666 spin_lock_irqsave(&par->accept_q_lock, flags); 667 list_del_init(&iucv_sk(sk)->accept_q); 668 spin_unlock_irqrestore(&par->accept_q_lock, flags); 669 sk_acceptq_removed(iucv_sk(sk)->parent); 670 iucv_sk(sk)->parent = NULL; 671 sock_put(sk); 672 } 673 674 struct sock *iucv_accept_dequeue(struct sock *parent, struct socket *newsock) 675 { 676 struct iucv_sock *isk, *n; 677 struct sock *sk; 678 679 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { 680 sk = (struct sock *) isk; 681 lock_sock(sk); 682 683 if (sk->sk_state == IUCV_CLOSED) { 684 iucv_accept_unlink(sk); 685 release_sock(sk); 686 continue; 687 } 688 689 if (sk->sk_state == IUCV_CONNECTED || 690 sk->sk_state == IUCV_DISCONN || 691 !newsock) { 692 iucv_accept_unlink(sk); 693 if (newsock) 694 sock_graft(sk, newsock); 695 696 release_sock(sk); 697 return sk; 698 } 699 700 release_sock(sk); 701 } 702 return NULL; 703 } 704 705 static void __iucv_auto_name(struct iucv_sock *iucv) 706 { 707 char name[12]; 708 709 sprintf(name, "%08x", atomic_inc_return(&iucv_sk_list.autobind_name)); 710 while (__iucv_get_sock_by_name(name)) { 711 sprintf(name, "%08x", 712 atomic_inc_return(&iucv_sk_list.autobind_name)); 713 } 714 memcpy(iucv->src_name, name, 8); 715 } 716 717 /* Bind an unbound socket */ 718 static int iucv_sock_bind(struct socket *sock, struct sockaddr *addr, 719 int addr_len) 720 { 721 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; 722 struct sock *sk = sock->sk; 723 struct iucv_sock *iucv; 724 int err = 0; 725 struct net_device *dev; 726 char uid[9]; 727 728 /* Verify the input sockaddr */ 729 if (addr_len < sizeof(struct sockaddr_iucv) || 730 addr->sa_family != AF_IUCV) 731 return -EINVAL; 732 733 lock_sock(sk); 734 if (sk->sk_state != IUCV_OPEN) { 735 err = -EBADFD; 736 goto done; 737 } 738 739 write_lock_bh(&iucv_sk_list.lock); 740 741 iucv = iucv_sk(sk); 742 if (__iucv_get_sock_by_name(sa->siucv_name)) { 743 err = -EADDRINUSE; 744 goto done_unlock; 745 } 746 if (iucv->path) 747 goto done_unlock; 748 749 /* Bind the socket */ 750 if (pr_iucv) 751 if (!memcmp(sa->siucv_user_id, iucv_userid, 8)) 752 goto vm_bind; /* VM IUCV transport */ 753 754 /* try hiper transport */ 755 memcpy(uid, sa->siucv_user_id, sizeof(uid)); 756 ASCEBC(uid, 8); 757 rcu_read_lock(); 758 for_each_netdev_rcu(&init_net, dev) { 759 if (!memcmp(dev->perm_addr, uid, 8)) { 760 memcpy(iucv->src_user_id, sa->siucv_user_id, 8); 761 /* Check for unitialized siucv_name */ 762 if (strncmp(sa->siucv_name, " ", 8) == 0) 763 __iucv_auto_name(iucv); 764 else 765 memcpy(iucv->src_name, sa->siucv_name, 8); 766 sk->sk_bound_dev_if = dev->ifindex; 767 iucv->hs_dev = dev; 768 dev_hold(dev); 769 sk->sk_state = IUCV_BOUND; 770 iucv->transport = AF_IUCV_TRANS_HIPER; 771 if (!iucv->msglimit) 772 iucv->msglimit = IUCV_HIPER_MSGLIM_DEFAULT; 773 rcu_read_unlock(); 774 goto done_unlock; 775 } 776 } 777 rcu_read_unlock(); 778 vm_bind: 779 if (pr_iucv) { 780 /* use local userid for backward compat */ 781 memcpy(iucv->src_name, sa->siucv_name, 8); 782 memcpy(iucv->src_user_id, iucv_userid, 8); 783 sk->sk_state = IUCV_BOUND; 784 iucv->transport = AF_IUCV_TRANS_IUCV; 785 if (!iucv->msglimit) 786 iucv->msglimit = IUCV_QUEUELEN_DEFAULT; 787 goto done_unlock; 788 } 789 /* found no dev to bind */ 790 err = -ENODEV; 791 done_unlock: 792 /* Release the socket list lock */ 793 write_unlock_bh(&iucv_sk_list.lock); 794 done: 795 release_sock(sk); 796 return err; 797 } 798 799 /* Automatically bind an unbound socket */ 800 static int iucv_sock_autobind(struct sock *sk) 801 { 802 struct iucv_sock *iucv = iucv_sk(sk); 803 int err = 0; 804 805 if (unlikely(!pr_iucv)) 806 return -EPROTO; 807 808 memcpy(iucv->src_user_id, iucv_userid, 8); 809 810 write_lock_bh(&iucv_sk_list.lock); 811 __iucv_auto_name(iucv); 812 write_unlock_bh(&iucv_sk_list.lock); 813 814 if (!iucv->msglimit) 815 iucv->msglimit = IUCV_QUEUELEN_DEFAULT; 816 817 return err; 818 } 819 820 static int afiucv_path_connect(struct socket *sock, struct sockaddr *addr) 821 { 822 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; 823 struct sock *sk = sock->sk; 824 struct iucv_sock *iucv = iucv_sk(sk); 825 unsigned char user_data[16]; 826 int err; 827 828 high_nmcpy(user_data, sa->siucv_name); 829 low_nmcpy(user_data, iucv->src_name); 830 ASCEBC(user_data, sizeof(user_data)); 831 832 /* Create path. */ 833 iucv->path = iucv_path_alloc(iucv->msglimit, 834 IUCV_IPRMDATA, GFP_KERNEL); 835 if (!iucv->path) { 836 err = -ENOMEM; 837 goto done; 838 } 839 err = pr_iucv->path_connect(iucv->path, &af_iucv_handler, 840 sa->siucv_user_id, NULL, user_data, 841 sk); 842 if (err) { 843 iucv_path_free(iucv->path); 844 iucv->path = NULL; 845 switch (err) { 846 case 0x0b: /* Target communicator is not logged on */ 847 err = -ENETUNREACH; 848 break; 849 case 0x0d: /* Max connections for this guest exceeded */ 850 case 0x0e: /* Max connections for target guest exceeded */ 851 err = -EAGAIN; 852 break; 853 case 0x0f: /* Missing IUCV authorization */ 854 err = -EACCES; 855 break; 856 default: 857 err = -ECONNREFUSED; 858 break; 859 } 860 } 861 done: 862 return err; 863 } 864 865 /* Connect an unconnected socket */ 866 static int iucv_sock_connect(struct socket *sock, struct sockaddr *addr, 867 int alen, int flags) 868 { 869 struct sockaddr_iucv *sa = (struct sockaddr_iucv *) addr; 870 struct sock *sk = sock->sk; 871 struct iucv_sock *iucv = iucv_sk(sk); 872 int err; 873 874 if (alen < sizeof(struct sockaddr_iucv) || addr->sa_family != AF_IUCV) 875 return -EINVAL; 876 877 if (sk->sk_state != IUCV_OPEN && sk->sk_state != IUCV_BOUND) 878 return -EBADFD; 879 880 if (sk->sk_state == IUCV_OPEN && 881 iucv->transport == AF_IUCV_TRANS_HIPER) 882 return -EBADFD; /* explicit bind required */ 883 884 if (sk->sk_type != SOCK_STREAM && sk->sk_type != SOCK_SEQPACKET) 885 return -EINVAL; 886 887 if (sk->sk_state == IUCV_OPEN) { 888 err = iucv_sock_autobind(sk); 889 if (unlikely(err)) 890 return err; 891 } 892 893 lock_sock(sk); 894 895 /* Set the destination information */ 896 memcpy(iucv->dst_user_id, sa->siucv_user_id, 8); 897 memcpy(iucv->dst_name, sa->siucv_name, 8); 898 899 if (iucv->transport == AF_IUCV_TRANS_HIPER) 900 err = iucv_send_ctrl(sock->sk, AF_IUCV_FLAG_SYN); 901 else 902 err = afiucv_path_connect(sock, addr); 903 if (err) 904 goto done; 905 906 if (sk->sk_state != IUCV_CONNECTED) 907 err = iucv_sock_wait(sk, iucv_sock_in_state(sk, IUCV_CONNECTED, 908 IUCV_DISCONN), 909 sock_sndtimeo(sk, flags & O_NONBLOCK)); 910 911 if (sk->sk_state == IUCV_DISCONN || sk->sk_state == IUCV_CLOSED) 912 err = -ECONNREFUSED; 913 914 if (err && iucv->transport == AF_IUCV_TRANS_IUCV) 915 iucv_sever_path(sk, 0); 916 917 done: 918 release_sock(sk); 919 return err; 920 } 921 922 /* Move a socket into listening state. */ 923 static int iucv_sock_listen(struct socket *sock, int backlog) 924 { 925 struct sock *sk = sock->sk; 926 int err; 927 928 lock_sock(sk); 929 930 err = -EINVAL; 931 if (sk->sk_state != IUCV_BOUND) 932 goto done; 933 934 if (sock->type != SOCK_STREAM && sock->type != SOCK_SEQPACKET) 935 goto done; 936 937 sk->sk_max_ack_backlog = backlog; 938 sk->sk_ack_backlog = 0; 939 sk->sk_state = IUCV_LISTEN; 940 err = 0; 941 942 done: 943 release_sock(sk); 944 return err; 945 } 946 947 /* Accept a pending connection */ 948 static int iucv_sock_accept(struct socket *sock, struct socket *newsock, 949 int flags, bool kern) 950 { 951 DECLARE_WAITQUEUE(wait, current); 952 struct sock *sk = sock->sk, *nsk; 953 long timeo; 954 int err = 0; 955 956 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 957 958 if (sk->sk_state != IUCV_LISTEN) { 959 err = -EBADFD; 960 goto done; 961 } 962 963 timeo = sock_rcvtimeo(sk, flags & O_NONBLOCK); 964 965 /* Wait for an incoming connection */ 966 add_wait_queue_exclusive(sk_sleep(sk), &wait); 967 while (!(nsk = iucv_accept_dequeue(sk, newsock))) { 968 set_current_state(TASK_INTERRUPTIBLE); 969 if (!timeo) { 970 err = -EAGAIN; 971 break; 972 } 973 974 release_sock(sk); 975 timeo = schedule_timeout(timeo); 976 lock_sock_nested(sk, SINGLE_DEPTH_NESTING); 977 978 if (sk->sk_state != IUCV_LISTEN) { 979 err = -EBADFD; 980 break; 981 } 982 983 if (signal_pending(current)) { 984 err = sock_intr_errno(timeo); 985 break; 986 } 987 } 988 989 set_current_state(TASK_RUNNING); 990 remove_wait_queue(sk_sleep(sk), &wait); 991 992 if (err) 993 goto done; 994 995 newsock->state = SS_CONNECTED; 996 997 done: 998 release_sock(sk); 999 return err; 1000 } 1001 1002 static int iucv_sock_getname(struct socket *sock, struct sockaddr *addr, 1003 int peer) 1004 { 1005 struct sockaddr_iucv *siucv = (struct sockaddr_iucv *) addr; 1006 struct sock *sk = sock->sk; 1007 struct iucv_sock *iucv = iucv_sk(sk); 1008 1009 addr->sa_family = AF_IUCV; 1010 1011 if (peer) { 1012 memcpy(siucv->siucv_user_id, iucv->dst_user_id, 8); 1013 memcpy(siucv->siucv_name, iucv->dst_name, 8); 1014 } else { 1015 memcpy(siucv->siucv_user_id, iucv->src_user_id, 8); 1016 memcpy(siucv->siucv_name, iucv->src_name, 8); 1017 } 1018 memset(&siucv->siucv_port, 0, sizeof(siucv->siucv_port)); 1019 memset(&siucv->siucv_addr, 0, sizeof(siucv->siucv_addr)); 1020 memset(&siucv->siucv_nodeid, 0, sizeof(siucv->siucv_nodeid)); 1021 1022 return sizeof(struct sockaddr_iucv); 1023 } 1024 1025 /** 1026 * iucv_send_iprm() - Send socket data in parameter list of an iucv message. 1027 * @path: IUCV path 1028 * @msg: Pointer to a struct iucv_message 1029 * @skb: The socket data to send, skb->len MUST BE <= 7 1030 * 1031 * Send the socket data in the parameter list in the iucv message 1032 * (IUCV_IPRMDATA). The socket data is stored at index 0 to 6 in the parameter 1033 * list and the socket data len at index 7 (last byte). 1034 * See also iucv_msg_length(). 1035 * 1036 * Returns the error code from the iucv_message_send() call. 1037 */ 1038 static int iucv_send_iprm(struct iucv_path *path, struct iucv_message *msg, 1039 struct sk_buff *skb) 1040 { 1041 u8 prmdata[8]; 1042 1043 memcpy(prmdata, (void *) skb->data, skb->len); 1044 prmdata[7] = 0xff - (u8) skb->len; 1045 return pr_iucv->message_send(path, msg, IUCV_IPRMDATA, 0, 1046 (void *) prmdata, 8); 1047 } 1048 1049 static int iucv_sock_sendmsg(struct socket *sock, struct msghdr *msg, 1050 size_t len) 1051 { 1052 struct sock *sk = sock->sk; 1053 struct iucv_sock *iucv = iucv_sk(sk); 1054 size_t headroom = 0; 1055 size_t linear; 1056 struct sk_buff *skb; 1057 struct iucv_message txmsg = {0}; 1058 struct cmsghdr *cmsg; 1059 int cmsg_done; 1060 long timeo; 1061 char user_id[9]; 1062 char appl_id[9]; 1063 int err; 1064 int noblock = msg->msg_flags & MSG_DONTWAIT; 1065 1066 err = sock_error(sk); 1067 if (err) 1068 return err; 1069 1070 if (msg->msg_flags & MSG_OOB) 1071 return -EOPNOTSUPP; 1072 1073 /* SOCK_SEQPACKET: we do not support segmented records */ 1074 if (sk->sk_type == SOCK_SEQPACKET && !(msg->msg_flags & MSG_EOR)) 1075 return -EOPNOTSUPP; 1076 1077 lock_sock(sk); 1078 1079 if (sk->sk_shutdown & SEND_SHUTDOWN) { 1080 err = -EPIPE; 1081 goto out; 1082 } 1083 1084 /* Return if the socket is not in connected state */ 1085 if (sk->sk_state != IUCV_CONNECTED) { 1086 err = -ENOTCONN; 1087 goto out; 1088 } 1089 1090 /* initialize defaults */ 1091 cmsg_done = 0; /* check for duplicate headers */ 1092 txmsg.class = 0; 1093 1094 /* iterate over control messages */ 1095 for_each_cmsghdr(cmsg, msg) { 1096 if (!CMSG_OK(msg, cmsg)) { 1097 err = -EINVAL; 1098 goto out; 1099 } 1100 1101 if (cmsg->cmsg_level != SOL_IUCV) 1102 continue; 1103 1104 if (cmsg->cmsg_type & cmsg_done) { 1105 err = -EINVAL; 1106 goto out; 1107 } 1108 cmsg_done |= cmsg->cmsg_type; 1109 1110 switch (cmsg->cmsg_type) { 1111 case SCM_IUCV_TRGCLS: 1112 if (cmsg->cmsg_len != CMSG_LEN(TRGCLS_SIZE)) { 1113 err = -EINVAL; 1114 goto out; 1115 } 1116 1117 /* set iucv message target class */ 1118 memcpy(&txmsg.class, 1119 (void *) CMSG_DATA(cmsg), TRGCLS_SIZE); 1120 1121 break; 1122 1123 default: 1124 err = -EINVAL; 1125 goto out; 1126 } 1127 } 1128 1129 /* allocate one skb for each iucv message: 1130 * this is fine for SOCK_SEQPACKET (unless we want to support 1131 * segmented records using the MSG_EOR flag), but 1132 * for SOCK_STREAM we might want to improve it in future */ 1133 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 1134 headroom = sizeof(struct af_iucv_trans_hdr) + ETH_HLEN; 1135 linear = len; 1136 } else { 1137 if (len < PAGE_SIZE) { 1138 linear = len; 1139 } else { 1140 /* In nonlinear "classic" iucv skb, 1141 * reserve space for iucv_array 1142 */ 1143 headroom = sizeof(struct iucv_array) * 1144 (MAX_SKB_FRAGS + 1); 1145 linear = PAGE_SIZE - headroom; 1146 } 1147 } 1148 skb = sock_alloc_send_pskb(sk, headroom + linear, len - linear, 1149 noblock, &err, 0); 1150 if (!skb) 1151 goto out; 1152 if (headroom) 1153 skb_reserve(skb, headroom); 1154 skb_put(skb, linear); 1155 skb->len = len; 1156 skb->data_len = len - linear; 1157 err = skb_copy_datagram_from_iter(skb, 0, &msg->msg_iter, len); 1158 if (err) 1159 goto fail; 1160 1161 /* wait if outstanding messages for iucv path has reached */ 1162 timeo = sock_sndtimeo(sk, noblock); 1163 err = iucv_sock_wait(sk, iucv_below_msglim(sk), timeo); 1164 if (err) 1165 goto fail; 1166 1167 /* return -ECONNRESET if the socket is no longer connected */ 1168 if (sk->sk_state != IUCV_CONNECTED) { 1169 err = -ECONNRESET; 1170 goto fail; 1171 } 1172 1173 /* increment and save iucv message tag for msg_completion cbk */ 1174 txmsg.tag = iucv->send_tag++; 1175 IUCV_SKB_CB(skb)->tag = txmsg.tag; 1176 1177 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 1178 atomic_inc(&iucv->msg_sent); 1179 err = afiucv_hs_send(&txmsg, sk, skb, 0); 1180 if (err) { 1181 atomic_dec(&iucv->msg_sent); 1182 goto out; 1183 } 1184 } else { /* Classic VM IUCV transport */ 1185 skb_queue_tail(&iucv->send_skb_q, skb); 1186 1187 if (((iucv->path->flags & IUCV_IPRMDATA) & iucv->flags) && 1188 skb->len <= 7) { 1189 err = iucv_send_iprm(iucv->path, &txmsg, skb); 1190 1191 /* on success: there is no message_complete callback */ 1192 /* for an IPRMDATA msg; remove skb from send queue */ 1193 if (err == 0) { 1194 skb_unlink(skb, &iucv->send_skb_q); 1195 kfree_skb(skb); 1196 } 1197 1198 /* this error should never happen since the */ 1199 /* IUCV_IPRMDATA path flag is set... sever path */ 1200 if (err == 0x15) { 1201 pr_iucv->path_sever(iucv->path, NULL); 1202 skb_unlink(skb, &iucv->send_skb_q); 1203 err = -EPIPE; 1204 goto fail; 1205 } 1206 } else if (skb_is_nonlinear(skb)) { 1207 struct iucv_array *iba = (struct iucv_array *)skb->head; 1208 int i; 1209 1210 /* skip iucv_array lying in the headroom */ 1211 iba[0].address = (u32)(addr_t)skb->data; 1212 iba[0].length = (u32)skb_headlen(skb); 1213 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1214 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 1215 1216 iba[i + 1].address = 1217 (u32)(addr_t)skb_frag_address(frag); 1218 iba[i + 1].length = (u32)skb_frag_size(frag); 1219 } 1220 err = pr_iucv->message_send(iucv->path, &txmsg, 1221 IUCV_IPBUFLST, 0, 1222 (void *)iba, skb->len); 1223 } else { /* non-IPRM Linear skb */ 1224 err = pr_iucv->message_send(iucv->path, &txmsg, 1225 0, 0, (void *)skb->data, skb->len); 1226 } 1227 if (err) { 1228 if (err == 3) { 1229 user_id[8] = 0; 1230 memcpy(user_id, iucv->dst_user_id, 8); 1231 appl_id[8] = 0; 1232 memcpy(appl_id, iucv->dst_name, 8); 1233 pr_err( 1234 "Application %s on z/VM guest %s exceeds message limit\n", 1235 appl_id, user_id); 1236 err = -EAGAIN; 1237 } else { 1238 err = -EPIPE; 1239 } 1240 skb_unlink(skb, &iucv->send_skb_q); 1241 goto fail; 1242 } 1243 } 1244 1245 release_sock(sk); 1246 return len; 1247 1248 fail: 1249 kfree_skb(skb); 1250 out: 1251 release_sock(sk); 1252 return err; 1253 } 1254 1255 static struct sk_buff *alloc_iucv_recv_skb(unsigned long len) 1256 { 1257 size_t headroom, linear; 1258 struct sk_buff *skb; 1259 int err; 1260 1261 if (len < PAGE_SIZE) { 1262 headroom = 0; 1263 linear = len; 1264 } else { 1265 headroom = sizeof(struct iucv_array) * (MAX_SKB_FRAGS + 1); 1266 linear = PAGE_SIZE - headroom; 1267 } 1268 skb = alloc_skb_with_frags(headroom + linear, len - linear, 1269 0, &err, GFP_ATOMIC | GFP_DMA); 1270 WARN_ONCE(!skb, 1271 "alloc of recv iucv skb len=%lu failed with errcode=%d\n", 1272 len, err); 1273 if (skb) { 1274 if (headroom) 1275 skb_reserve(skb, headroom); 1276 skb_put(skb, linear); 1277 skb->len = len; 1278 skb->data_len = len - linear; 1279 } 1280 return skb; 1281 } 1282 1283 /* iucv_process_message() - Receive a single outstanding IUCV message 1284 * 1285 * Locking: must be called with message_q.lock held 1286 */ 1287 static void iucv_process_message(struct sock *sk, struct sk_buff *skb, 1288 struct iucv_path *path, 1289 struct iucv_message *msg) 1290 { 1291 int rc; 1292 unsigned int len; 1293 1294 len = iucv_msg_length(msg); 1295 1296 /* store msg target class in the second 4 bytes of skb ctrl buffer */ 1297 /* Note: the first 4 bytes are reserved for msg tag */ 1298 IUCV_SKB_CB(skb)->class = msg->class; 1299 1300 /* check for special IPRM messages (e.g. iucv_sock_shutdown) */ 1301 if ((msg->flags & IUCV_IPRMDATA) && len > 7) { 1302 if (memcmp(msg->rmmsg, iprm_shutdown, 8) == 0) { 1303 skb->data = NULL; 1304 skb->len = 0; 1305 } 1306 } else { 1307 if (skb_is_nonlinear(skb)) { 1308 struct iucv_array *iba = (struct iucv_array *)skb->head; 1309 int i; 1310 1311 iba[0].address = (u32)(addr_t)skb->data; 1312 iba[0].length = (u32)skb_headlen(skb); 1313 for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) { 1314 skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; 1315 1316 iba[i + 1].address = 1317 (u32)(addr_t)skb_frag_address(frag); 1318 iba[i + 1].length = (u32)skb_frag_size(frag); 1319 } 1320 rc = pr_iucv->message_receive(path, msg, 1321 IUCV_IPBUFLST, 1322 (void *)iba, len, NULL); 1323 } else { 1324 rc = pr_iucv->message_receive(path, msg, 1325 msg->flags & IUCV_IPRMDATA, 1326 skb->data, len, NULL); 1327 } 1328 if (rc) { 1329 kfree_skb(skb); 1330 return; 1331 } 1332 WARN_ON_ONCE(skb->len != len); 1333 } 1334 1335 IUCV_SKB_CB(skb)->offset = 0; 1336 if (sk_filter(sk, skb)) { 1337 atomic_inc(&sk->sk_drops); /* skb rejected by filter */ 1338 kfree_skb(skb); 1339 return; 1340 } 1341 if (__sock_queue_rcv_skb(sk, skb)) /* handle rcv queue full */ 1342 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb); 1343 } 1344 1345 /* iucv_process_message_q() - Process outstanding IUCV messages 1346 * 1347 * Locking: must be called with message_q.lock held 1348 */ 1349 static void iucv_process_message_q(struct sock *sk) 1350 { 1351 struct iucv_sock *iucv = iucv_sk(sk); 1352 struct sk_buff *skb; 1353 struct sock_msg_q *p, *n; 1354 1355 list_for_each_entry_safe(p, n, &iucv->message_q.list, list) { 1356 skb = alloc_iucv_recv_skb(iucv_msg_length(&p->msg)); 1357 if (!skb) 1358 break; 1359 iucv_process_message(sk, skb, p->path, &p->msg); 1360 list_del(&p->list); 1361 kfree(p); 1362 if (!skb_queue_empty(&iucv->backlog_skb_q)) 1363 break; 1364 } 1365 } 1366 1367 static int iucv_sock_recvmsg(struct socket *sock, struct msghdr *msg, 1368 size_t len, int flags) 1369 { 1370 int noblock = flags & MSG_DONTWAIT; 1371 struct sock *sk = sock->sk; 1372 struct iucv_sock *iucv = iucv_sk(sk); 1373 unsigned int copied, rlen; 1374 struct sk_buff *skb, *rskb, *cskb; 1375 int err = 0; 1376 u32 offset; 1377 1378 if ((sk->sk_state == IUCV_DISCONN) && 1379 skb_queue_empty(&iucv->backlog_skb_q) && 1380 skb_queue_empty(&sk->sk_receive_queue) && 1381 list_empty(&iucv->message_q.list)) 1382 return 0; 1383 1384 if (flags & (MSG_OOB)) 1385 return -EOPNOTSUPP; 1386 1387 /* receive/dequeue next skb: 1388 * the function understands MSG_PEEK and, thus, does not dequeue skb */ 1389 skb = skb_recv_datagram(sk, flags, noblock, &err); 1390 if (!skb) { 1391 if (sk->sk_shutdown & RCV_SHUTDOWN) 1392 return 0; 1393 return err; 1394 } 1395 1396 offset = IUCV_SKB_CB(skb)->offset; 1397 rlen = skb->len - offset; /* real length of skb */ 1398 copied = min_t(unsigned int, rlen, len); 1399 if (!rlen) 1400 sk->sk_shutdown = sk->sk_shutdown | RCV_SHUTDOWN; 1401 1402 cskb = skb; 1403 if (skb_copy_datagram_msg(cskb, offset, msg, copied)) { 1404 if (!(flags & MSG_PEEK)) 1405 skb_queue_head(&sk->sk_receive_queue, skb); 1406 return -EFAULT; 1407 } 1408 1409 /* SOCK_SEQPACKET: set MSG_TRUNC if recv buf size is too small */ 1410 if (sk->sk_type == SOCK_SEQPACKET) { 1411 if (copied < rlen) 1412 msg->msg_flags |= MSG_TRUNC; 1413 /* each iucv message contains a complete record */ 1414 msg->msg_flags |= MSG_EOR; 1415 } 1416 1417 /* create control message to store iucv msg target class: 1418 * get the trgcls from the control buffer of the skb due to 1419 * fragmentation of original iucv message. */ 1420 err = put_cmsg(msg, SOL_IUCV, SCM_IUCV_TRGCLS, 1421 sizeof(IUCV_SKB_CB(skb)->class), 1422 (void *)&IUCV_SKB_CB(skb)->class); 1423 if (err) { 1424 if (!(flags & MSG_PEEK)) 1425 skb_queue_head(&sk->sk_receive_queue, skb); 1426 return err; 1427 } 1428 1429 /* Mark read part of skb as used */ 1430 if (!(flags & MSG_PEEK)) { 1431 1432 /* SOCK_STREAM: re-queue skb if it contains unreceived data */ 1433 if (sk->sk_type == SOCK_STREAM) { 1434 if (copied < rlen) { 1435 IUCV_SKB_CB(skb)->offset = offset + copied; 1436 skb_queue_head(&sk->sk_receive_queue, skb); 1437 goto done; 1438 } 1439 } 1440 1441 kfree_skb(skb); 1442 if (iucv->transport == AF_IUCV_TRANS_HIPER) { 1443 atomic_inc(&iucv->msg_recv); 1444 if (atomic_read(&iucv->msg_recv) > iucv->msglimit) { 1445 WARN_ON(1); 1446 iucv_sock_close(sk); 1447 return -EFAULT; 1448 } 1449 } 1450 1451 /* Queue backlog skbs */ 1452 spin_lock_bh(&iucv->message_q.lock); 1453 rskb = skb_dequeue(&iucv->backlog_skb_q); 1454 while (rskb) { 1455 IUCV_SKB_CB(rskb)->offset = 0; 1456 if (__sock_queue_rcv_skb(sk, rskb)) { 1457 /* handle rcv queue full */ 1458 skb_queue_head(&iucv->backlog_skb_q, 1459 rskb); 1460 break; 1461 } 1462 rskb = skb_dequeue(&iucv->backlog_skb_q); 1463 } 1464 if (skb_queue_empty(&iucv->backlog_skb_q)) { 1465 if (!list_empty(&iucv->message_q.list)) 1466 iucv_process_message_q(sk); 1467 if (atomic_read(&iucv->msg_recv) >= 1468 iucv->msglimit / 2) { 1469 err = iucv_send_ctrl(sk, AF_IUCV_FLAG_WIN); 1470 if (err) { 1471 sk->sk_state = IUCV_DISCONN; 1472 sk->sk_state_change(sk); 1473 } 1474 } 1475 } 1476 spin_unlock_bh(&iucv->message_q.lock); 1477 } 1478 1479 done: 1480 /* SOCK_SEQPACKET: return real length if MSG_TRUNC is set */ 1481 if (sk->sk_type == SOCK_SEQPACKET && (flags & MSG_TRUNC)) 1482 copied = rlen; 1483 1484 return copied; 1485 } 1486 1487 static inline __poll_t iucv_accept_poll(struct sock *parent) 1488 { 1489 struct iucv_sock *isk, *n; 1490 struct sock *sk; 1491 1492 list_for_each_entry_safe(isk, n, &iucv_sk(parent)->accept_q, accept_q) { 1493 sk = (struct sock *) isk; 1494 1495 if (sk->sk_state == IUCV_CONNECTED) 1496 return EPOLLIN | EPOLLRDNORM; 1497 } 1498 1499 return 0; 1500 } 1501 1502 __poll_t iucv_sock_poll(struct file *file, struct socket *sock, 1503 poll_table *wait) 1504 { 1505 struct sock *sk = sock->sk; 1506 __poll_t mask = 0; 1507 1508 sock_poll_wait(file, sock, wait); 1509 1510 if (sk->sk_state == IUCV_LISTEN) 1511 return iucv_accept_poll(sk); 1512 1513 if (sk->sk_err || !skb_queue_empty(&sk->sk_error_queue)) 1514 mask |= EPOLLERR | 1515 (sock_flag(sk, SOCK_SELECT_ERR_QUEUE) ? EPOLLPRI : 0); 1516 1517 if (sk->sk_shutdown & RCV_SHUTDOWN) 1518 mask |= EPOLLRDHUP; 1519 1520 if (sk->sk_shutdown == SHUTDOWN_MASK) 1521 mask |= EPOLLHUP; 1522 1523 if (!skb_queue_empty(&sk->sk_receive_queue) || 1524 (sk->sk_shutdown & RCV_SHUTDOWN)) 1525 mask |= EPOLLIN | EPOLLRDNORM; 1526 1527 if (sk->sk_state == IUCV_CLOSED) 1528 mask |= EPOLLHUP; 1529 1530 if (sk->sk_state == IUCV_DISCONN) 1531 mask |= EPOLLIN; 1532 1533 if (sock_writeable(sk) && iucv_below_msglim(sk)) 1534 mask |= EPOLLOUT | EPOLLWRNORM | EPOLLWRBAND; 1535 else 1536 sk_set_bit(SOCKWQ_ASYNC_NOSPACE, sk); 1537 1538 return mask; 1539 } 1540 1541 static int iucv_sock_shutdown(struct socket *sock, int how) 1542 { 1543 struct sock *sk = sock->sk; 1544 struct iucv_sock *iucv = iucv_sk(sk); 1545 struct iucv_message txmsg; 1546 int err = 0; 1547 1548 how++; 1549 1550 if ((how & ~SHUTDOWN_MASK) || !how) 1551 return -EINVAL; 1552 1553 lock_sock(sk); 1554 switch (sk->sk_state) { 1555 case IUCV_LISTEN: 1556 case IUCV_DISCONN: 1557 case IUCV_CLOSING: 1558 case IUCV_CLOSED: 1559 err = -ENOTCONN; 1560 goto fail; 1561 default: 1562 break; 1563 } 1564 1565 if (how == SEND_SHUTDOWN || how == SHUTDOWN_MASK) { 1566 if (iucv->transport == AF_IUCV_TRANS_IUCV) { 1567 txmsg.class = 0; 1568 txmsg.tag = 0; 1569 err = pr_iucv->message_send(iucv->path, &txmsg, 1570 IUCV_IPRMDATA, 0, (void *) iprm_shutdown, 8); 1571 if (err) { 1572 switch (err) { 1573 case 1: 1574 err = -ENOTCONN; 1575 break; 1576 case 2: 1577 err = -ECONNRESET; 1578 break; 1579 default: 1580 err = -ENOTCONN; 1581 break; 1582 } 1583 } 1584 } else 1585 iucv_send_ctrl(sk, AF_IUCV_FLAG_SHT); 1586 } 1587 1588 sk->sk_shutdown |= how; 1589 if (how == RCV_SHUTDOWN || how == SHUTDOWN_MASK) { 1590 if ((iucv->transport == AF_IUCV_TRANS_IUCV) && 1591 iucv->path) { 1592 err = pr_iucv->path_quiesce(iucv->path, NULL); 1593 if (err) 1594 err = -ENOTCONN; 1595 /* skb_queue_purge(&sk->sk_receive_queue); */ 1596 } 1597 skb_queue_purge(&sk->sk_receive_queue); 1598 } 1599 1600 /* Wake up anyone sleeping in poll */ 1601 sk->sk_state_change(sk); 1602 1603 fail: 1604 release_sock(sk); 1605 return err; 1606 } 1607 1608 static int iucv_sock_release(struct socket *sock) 1609 { 1610 struct sock *sk = sock->sk; 1611 int err = 0; 1612 1613 if (!sk) 1614 return 0; 1615 1616 iucv_sock_close(sk); 1617 1618 sock_orphan(sk); 1619 iucv_sock_kill(sk); 1620 return err; 1621 } 1622 1623 /* getsockopt and setsockopt */ 1624 static int iucv_sock_setsockopt(struct socket *sock, int level, int optname, 1625 char __user *optval, unsigned int optlen) 1626 { 1627 struct sock *sk = sock->sk; 1628 struct iucv_sock *iucv = iucv_sk(sk); 1629 int val; 1630 int rc; 1631 1632 if (level != SOL_IUCV) 1633 return -ENOPROTOOPT; 1634 1635 if (optlen < sizeof(int)) 1636 return -EINVAL; 1637 1638 if (get_user(val, (int __user *) optval)) 1639 return -EFAULT; 1640 1641 rc = 0; 1642 1643 lock_sock(sk); 1644 switch (optname) { 1645 case SO_IPRMDATA_MSG: 1646 if (val) 1647 iucv->flags |= IUCV_IPRMDATA; 1648 else 1649 iucv->flags &= ~IUCV_IPRMDATA; 1650 break; 1651 case SO_MSGLIMIT: 1652 switch (sk->sk_state) { 1653 case IUCV_OPEN: 1654 case IUCV_BOUND: 1655 if (val < 1 || val > (u16)(~0)) 1656 rc = -EINVAL; 1657 else 1658 iucv->msglimit = val; 1659 break; 1660 default: 1661 rc = -EINVAL; 1662 break; 1663 } 1664 break; 1665 default: 1666 rc = -ENOPROTOOPT; 1667 break; 1668 } 1669 release_sock(sk); 1670 1671 return rc; 1672 } 1673 1674 static int iucv_sock_getsockopt(struct socket *sock, int level, int optname, 1675 char __user *optval, int __user *optlen) 1676 { 1677 struct sock *sk = sock->sk; 1678 struct iucv_sock *iucv = iucv_sk(sk); 1679 unsigned int val; 1680 int len; 1681 1682 if (level != SOL_IUCV) 1683 return -ENOPROTOOPT; 1684 1685 if (get_user(len, optlen)) 1686 return -EFAULT; 1687 1688 if (len < 0) 1689 return -EINVAL; 1690 1691 len = min_t(unsigned int, len, sizeof(int)); 1692 1693 switch (optname) { 1694 case SO_IPRMDATA_MSG: 1695 val = (iucv->flags & IUCV_IPRMDATA) ? 1 : 0; 1696 break; 1697 case SO_MSGLIMIT: 1698 lock_sock(sk); 1699 val = (iucv->path != NULL) ? iucv->path->msglim /* connected */ 1700 : iucv->msglimit; /* default */ 1701 release_sock(sk); 1702 break; 1703 case SO_MSGSIZE: 1704 if (sk->sk_state == IUCV_OPEN) 1705 return -EBADFD; 1706 val = (iucv->hs_dev) ? iucv->hs_dev->mtu - 1707 sizeof(struct af_iucv_trans_hdr) - ETH_HLEN : 1708 0x7fffffff; 1709 break; 1710 default: 1711 return -ENOPROTOOPT; 1712 } 1713 1714 if (put_user(len, optlen)) 1715 return -EFAULT; 1716 if (copy_to_user(optval, &val, len)) 1717 return -EFAULT; 1718 1719 return 0; 1720 } 1721 1722 1723 /* Callback wrappers - called from iucv base support */ 1724 static int iucv_callback_connreq(struct iucv_path *path, 1725 u8 ipvmid[8], u8 ipuser[16]) 1726 { 1727 unsigned char user_data[16]; 1728 unsigned char nuser_data[16]; 1729 unsigned char src_name[8]; 1730 struct sock *sk, *nsk; 1731 struct iucv_sock *iucv, *niucv; 1732 int err; 1733 1734 memcpy(src_name, ipuser, 8); 1735 EBCASC(src_name, 8); 1736 /* Find out if this path belongs to af_iucv. */ 1737 read_lock(&iucv_sk_list.lock); 1738 iucv = NULL; 1739 sk = NULL; 1740 sk_for_each(sk, &iucv_sk_list.head) 1741 if (sk->sk_state == IUCV_LISTEN && 1742 !memcmp(&iucv_sk(sk)->src_name, src_name, 8)) { 1743 /* 1744 * Found a listening socket with 1745 * src_name == ipuser[0-7]. 1746 */ 1747 iucv = iucv_sk(sk); 1748 break; 1749 } 1750 read_unlock(&iucv_sk_list.lock); 1751 if (!iucv) 1752 /* No socket found, not one of our paths. */ 1753 return -EINVAL; 1754 1755 bh_lock_sock(sk); 1756 1757 /* Check if parent socket is listening */ 1758 low_nmcpy(user_data, iucv->src_name); 1759 high_nmcpy(user_data, iucv->dst_name); 1760 ASCEBC(user_data, sizeof(user_data)); 1761 if (sk->sk_state != IUCV_LISTEN) { 1762 err = pr_iucv->path_sever(path, user_data); 1763 iucv_path_free(path); 1764 goto fail; 1765 } 1766 1767 /* Check for backlog size */ 1768 if (sk_acceptq_is_full(sk)) { 1769 err = pr_iucv->path_sever(path, user_data); 1770 iucv_path_free(path); 1771 goto fail; 1772 } 1773 1774 /* Create the new socket */ 1775 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0); 1776 if (!nsk) { 1777 err = pr_iucv->path_sever(path, user_data); 1778 iucv_path_free(path); 1779 goto fail; 1780 } 1781 1782 niucv = iucv_sk(nsk); 1783 iucv_sock_init(nsk, sk); 1784 1785 /* Set the new iucv_sock */ 1786 memcpy(niucv->dst_name, ipuser + 8, 8); 1787 EBCASC(niucv->dst_name, 8); 1788 memcpy(niucv->dst_user_id, ipvmid, 8); 1789 memcpy(niucv->src_name, iucv->src_name, 8); 1790 memcpy(niucv->src_user_id, iucv->src_user_id, 8); 1791 niucv->path = path; 1792 1793 /* Call iucv_accept */ 1794 high_nmcpy(nuser_data, ipuser + 8); 1795 memcpy(nuser_data + 8, niucv->src_name, 8); 1796 ASCEBC(nuser_data + 8, 8); 1797 1798 /* set message limit for path based on msglimit of accepting socket */ 1799 niucv->msglimit = iucv->msglimit; 1800 path->msglim = iucv->msglimit; 1801 err = pr_iucv->path_accept(path, &af_iucv_handler, nuser_data, nsk); 1802 if (err) { 1803 iucv_sever_path(nsk, 1); 1804 iucv_sock_kill(nsk); 1805 goto fail; 1806 } 1807 1808 iucv_accept_enqueue(sk, nsk); 1809 1810 /* Wake up accept */ 1811 nsk->sk_state = IUCV_CONNECTED; 1812 sk->sk_data_ready(sk); 1813 err = 0; 1814 fail: 1815 bh_unlock_sock(sk); 1816 return 0; 1817 } 1818 1819 static void iucv_callback_connack(struct iucv_path *path, u8 ipuser[16]) 1820 { 1821 struct sock *sk = path->private; 1822 1823 sk->sk_state = IUCV_CONNECTED; 1824 sk->sk_state_change(sk); 1825 } 1826 1827 static void iucv_callback_rx(struct iucv_path *path, struct iucv_message *msg) 1828 { 1829 struct sock *sk = path->private; 1830 struct iucv_sock *iucv = iucv_sk(sk); 1831 struct sk_buff *skb; 1832 struct sock_msg_q *save_msg; 1833 int len; 1834 1835 if (sk->sk_shutdown & RCV_SHUTDOWN) { 1836 pr_iucv->message_reject(path, msg); 1837 return; 1838 } 1839 1840 spin_lock(&iucv->message_q.lock); 1841 1842 if (!list_empty(&iucv->message_q.list) || 1843 !skb_queue_empty(&iucv->backlog_skb_q)) 1844 goto save_message; 1845 1846 len = atomic_read(&sk->sk_rmem_alloc); 1847 len += SKB_TRUESIZE(iucv_msg_length(msg)); 1848 if (len > sk->sk_rcvbuf) 1849 goto save_message; 1850 1851 skb = alloc_iucv_recv_skb(iucv_msg_length(msg)); 1852 if (!skb) 1853 goto save_message; 1854 1855 iucv_process_message(sk, skb, path, msg); 1856 goto out_unlock; 1857 1858 save_message: 1859 save_msg = kzalloc(sizeof(struct sock_msg_q), GFP_ATOMIC | GFP_DMA); 1860 if (!save_msg) 1861 goto out_unlock; 1862 save_msg->path = path; 1863 save_msg->msg = *msg; 1864 1865 list_add_tail(&save_msg->list, &iucv->message_q.list); 1866 1867 out_unlock: 1868 spin_unlock(&iucv->message_q.lock); 1869 } 1870 1871 static void iucv_callback_txdone(struct iucv_path *path, 1872 struct iucv_message *msg) 1873 { 1874 struct sock *sk = path->private; 1875 struct sk_buff *this = NULL; 1876 struct sk_buff_head *list = &iucv_sk(sk)->send_skb_q; 1877 struct sk_buff *list_skb; 1878 unsigned long flags; 1879 1880 bh_lock_sock(sk); 1881 1882 spin_lock_irqsave(&list->lock, flags); 1883 skb_queue_walk(list, list_skb) { 1884 if (msg->tag == IUCV_SKB_CB(list_skb)->tag) { 1885 this = list_skb; 1886 break; 1887 } 1888 } 1889 if (this) 1890 __skb_unlink(this, list); 1891 spin_unlock_irqrestore(&list->lock, flags); 1892 1893 if (this) { 1894 kfree_skb(this); 1895 /* wake up any process waiting for sending */ 1896 iucv_sock_wake_msglim(sk); 1897 } 1898 1899 if (sk->sk_state == IUCV_CLOSING) { 1900 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { 1901 sk->sk_state = IUCV_CLOSED; 1902 sk->sk_state_change(sk); 1903 } 1904 } 1905 bh_unlock_sock(sk); 1906 1907 } 1908 1909 static void iucv_callback_connrej(struct iucv_path *path, u8 ipuser[16]) 1910 { 1911 struct sock *sk = path->private; 1912 1913 if (sk->sk_state == IUCV_CLOSED) 1914 return; 1915 1916 bh_lock_sock(sk); 1917 iucv_sever_path(sk, 1); 1918 sk->sk_state = IUCV_DISCONN; 1919 1920 sk->sk_state_change(sk); 1921 bh_unlock_sock(sk); 1922 } 1923 1924 /* called if the other communication side shuts down its RECV direction; 1925 * in turn, the callback sets SEND_SHUTDOWN to disable sending of data. 1926 */ 1927 static void iucv_callback_shutdown(struct iucv_path *path, u8 ipuser[16]) 1928 { 1929 struct sock *sk = path->private; 1930 1931 bh_lock_sock(sk); 1932 if (sk->sk_state != IUCV_CLOSED) { 1933 sk->sk_shutdown |= SEND_SHUTDOWN; 1934 sk->sk_state_change(sk); 1935 } 1936 bh_unlock_sock(sk); 1937 } 1938 1939 /***************** HiperSockets transport callbacks ********************/ 1940 static void afiucv_swap_src_dest(struct sk_buff *skb) 1941 { 1942 struct af_iucv_trans_hdr *trans_hdr = iucv_trans_hdr(skb); 1943 char tmpID[8]; 1944 char tmpName[8]; 1945 1946 ASCEBC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); 1947 ASCEBC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); 1948 ASCEBC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); 1949 ASCEBC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); 1950 memcpy(tmpID, trans_hdr->srcUserID, 8); 1951 memcpy(tmpName, trans_hdr->srcAppName, 8); 1952 memcpy(trans_hdr->srcUserID, trans_hdr->destUserID, 8); 1953 memcpy(trans_hdr->srcAppName, trans_hdr->destAppName, 8); 1954 memcpy(trans_hdr->destUserID, tmpID, 8); 1955 memcpy(trans_hdr->destAppName, tmpName, 8); 1956 skb_push(skb, ETH_HLEN); 1957 memset(skb->data, 0, ETH_HLEN); 1958 } 1959 1960 /** 1961 * afiucv_hs_callback_syn - react on received SYN 1962 **/ 1963 static int afiucv_hs_callback_syn(struct sock *sk, struct sk_buff *skb) 1964 { 1965 struct af_iucv_trans_hdr *trans_hdr = iucv_trans_hdr(skb); 1966 struct sock *nsk; 1967 struct iucv_sock *iucv, *niucv; 1968 int err; 1969 1970 iucv = iucv_sk(sk); 1971 if (!iucv) { 1972 /* no sock - connection refused */ 1973 afiucv_swap_src_dest(skb); 1974 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; 1975 err = dev_queue_xmit(skb); 1976 goto out; 1977 } 1978 1979 nsk = iucv_sock_alloc(NULL, sk->sk_type, GFP_ATOMIC, 0); 1980 bh_lock_sock(sk); 1981 if ((sk->sk_state != IUCV_LISTEN) || 1982 sk_acceptq_is_full(sk) || 1983 !nsk) { 1984 /* error on server socket - connection refused */ 1985 afiucv_swap_src_dest(skb); 1986 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN; 1987 err = dev_queue_xmit(skb); 1988 iucv_sock_kill(nsk); 1989 bh_unlock_sock(sk); 1990 goto out; 1991 } 1992 1993 niucv = iucv_sk(nsk); 1994 iucv_sock_init(nsk, sk); 1995 niucv->transport = AF_IUCV_TRANS_HIPER; 1996 niucv->msglimit = iucv->msglimit; 1997 if (!trans_hdr->window) 1998 niucv->msglimit_peer = IUCV_HIPER_MSGLIM_DEFAULT; 1999 else 2000 niucv->msglimit_peer = trans_hdr->window; 2001 memcpy(niucv->dst_name, trans_hdr->srcAppName, 8); 2002 memcpy(niucv->dst_user_id, trans_hdr->srcUserID, 8); 2003 memcpy(niucv->src_name, iucv->src_name, 8); 2004 memcpy(niucv->src_user_id, iucv->src_user_id, 8); 2005 nsk->sk_bound_dev_if = sk->sk_bound_dev_if; 2006 niucv->hs_dev = iucv->hs_dev; 2007 dev_hold(niucv->hs_dev); 2008 afiucv_swap_src_dest(skb); 2009 trans_hdr->flags = AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK; 2010 trans_hdr->window = niucv->msglimit; 2011 /* if receiver acks the xmit connection is established */ 2012 err = dev_queue_xmit(skb); 2013 if (!err) { 2014 iucv_accept_enqueue(sk, nsk); 2015 nsk->sk_state = IUCV_CONNECTED; 2016 sk->sk_data_ready(sk); 2017 } else 2018 iucv_sock_kill(nsk); 2019 bh_unlock_sock(sk); 2020 2021 out: 2022 return NET_RX_SUCCESS; 2023 } 2024 2025 /** 2026 * afiucv_hs_callback_synack() - react on received SYN-ACK 2027 **/ 2028 static int afiucv_hs_callback_synack(struct sock *sk, struct sk_buff *skb) 2029 { 2030 struct iucv_sock *iucv = iucv_sk(sk); 2031 2032 if (!iucv) 2033 goto out; 2034 if (sk->sk_state != IUCV_BOUND) 2035 goto out; 2036 bh_lock_sock(sk); 2037 iucv->msglimit_peer = iucv_trans_hdr(skb)->window; 2038 sk->sk_state = IUCV_CONNECTED; 2039 sk->sk_state_change(sk); 2040 bh_unlock_sock(sk); 2041 out: 2042 kfree_skb(skb); 2043 return NET_RX_SUCCESS; 2044 } 2045 2046 /** 2047 * afiucv_hs_callback_synfin() - react on received SYN_FIN 2048 **/ 2049 static int afiucv_hs_callback_synfin(struct sock *sk, struct sk_buff *skb) 2050 { 2051 struct iucv_sock *iucv = iucv_sk(sk); 2052 2053 if (!iucv) 2054 goto out; 2055 if (sk->sk_state != IUCV_BOUND) 2056 goto out; 2057 bh_lock_sock(sk); 2058 sk->sk_state = IUCV_DISCONN; 2059 sk->sk_state_change(sk); 2060 bh_unlock_sock(sk); 2061 out: 2062 kfree_skb(skb); 2063 return NET_RX_SUCCESS; 2064 } 2065 2066 /** 2067 * afiucv_hs_callback_fin() - react on received FIN 2068 **/ 2069 static int afiucv_hs_callback_fin(struct sock *sk, struct sk_buff *skb) 2070 { 2071 struct iucv_sock *iucv = iucv_sk(sk); 2072 2073 /* other end of connection closed */ 2074 if (!iucv) 2075 goto out; 2076 bh_lock_sock(sk); 2077 if (sk->sk_state == IUCV_CONNECTED) { 2078 sk->sk_state = IUCV_DISCONN; 2079 sk->sk_state_change(sk); 2080 } 2081 bh_unlock_sock(sk); 2082 out: 2083 kfree_skb(skb); 2084 return NET_RX_SUCCESS; 2085 } 2086 2087 /** 2088 * afiucv_hs_callback_win() - react on received WIN 2089 **/ 2090 static int afiucv_hs_callback_win(struct sock *sk, struct sk_buff *skb) 2091 { 2092 struct iucv_sock *iucv = iucv_sk(sk); 2093 2094 if (!iucv) 2095 return NET_RX_SUCCESS; 2096 2097 if (sk->sk_state != IUCV_CONNECTED) 2098 return NET_RX_SUCCESS; 2099 2100 atomic_sub(iucv_trans_hdr(skb)->window, &iucv->msg_sent); 2101 iucv_sock_wake_msglim(sk); 2102 return NET_RX_SUCCESS; 2103 } 2104 2105 /** 2106 * afiucv_hs_callback_rx() - react on received data 2107 **/ 2108 static int afiucv_hs_callback_rx(struct sock *sk, struct sk_buff *skb) 2109 { 2110 struct iucv_sock *iucv = iucv_sk(sk); 2111 2112 if (!iucv) { 2113 kfree_skb(skb); 2114 return NET_RX_SUCCESS; 2115 } 2116 2117 if (sk->sk_state != IUCV_CONNECTED) { 2118 kfree_skb(skb); 2119 return NET_RX_SUCCESS; 2120 } 2121 2122 if (sk->sk_shutdown & RCV_SHUTDOWN) { 2123 kfree_skb(skb); 2124 return NET_RX_SUCCESS; 2125 } 2126 2127 /* write stuff from iucv_msg to skb cb */ 2128 skb_pull(skb, sizeof(struct af_iucv_trans_hdr)); 2129 skb_reset_transport_header(skb); 2130 skb_reset_network_header(skb); 2131 IUCV_SKB_CB(skb)->offset = 0; 2132 if (sk_filter(sk, skb)) { 2133 atomic_inc(&sk->sk_drops); /* skb rejected by filter */ 2134 kfree_skb(skb); 2135 return NET_RX_SUCCESS; 2136 } 2137 2138 spin_lock(&iucv->message_q.lock); 2139 if (skb_queue_empty(&iucv->backlog_skb_q)) { 2140 if (__sock_queue_rcv_skb(sk, skb)) 2141 /* handle rcv queue full */ 2142 skb_queue_tail(&iucv->backlog_skb_q, skb); 2143 } else 2144 skb_queue_tail(&iucv_sk(sk)->backlog_skb_q, skb); 2145 spin_unlock(&iucv->message_q.lock); 2146 return NET_RX_SUCCESS; 2147 } 2148 2149 /** 2150 * afiucv_hs_rcv() - base function for arriving data through HiperSockets 2151 * transport 2152 * called from netif RX softirq 2153 **/ 2154 static int afiucv_hs_rcv(struct sk_buff *skb, struct net_device *dev, 2155 struct packet_type *pt, struct net_device *orig_dev) 2156 { 2157 struct sock *sk; 2158 struct iucv_sock *iucv; 2159 struct af_iucv_trans_hdr *trans_hdr; 2160 int err = NET_RX_SUCCESS; 2161 char nullstring[8]; 2162 2163 if (!pskb_may_pull(skb, sizeof(*trans_hdr))) { 2164 WARN_ONCE(1, "AF_IUCV failed to receive skb, len=%u", skb->len); 2165 kfree_skb(skb); 2166 return NET_RX_SUCCESS; 2167 } 2168 2169 trans_hdr = iucv_trans_hdr(skb); 2170 EBCASC(trans_hdr->destAppName, sizeof(trans_hdr->destAppName)); 2171 EBCASC(trans_hdr->destUserID, sizeof(trans_hdr->destUserID)); 2172 EBCASC(trans_hdr->srcAppName, sizeof(trans_hdr->srcAppName)); 2173 EBCASC(trans_hdr->srcUserID, sizeof(trans_hdr->srcUserID)); 2174 memset(nullstring, 0, sizeof(nullstring)); 2175 iucv = NULL; 2176 sk = NULL; 2177 read_lock(&iucv_sk_list.lock); 2178 sk_for_each(sk, &iucv_sk_list.head) { 2179 if (trans_hdr->flags == AF_IUCV_FLAG_SYN) { 2180 if ((!memcmp(&iucv_sk(sk)->src_name, 2181 trans_hdr->destAppName, 8)) && 2182 (!memcmp(&iucv_sk(sk)->src_user_id, 2183 trans_hdr->destUserID, 8)) && 2184 (!memcmp(&iucv_sk(sk)->dst_name, nullstring, 8)) && 2185 (!memcmp(&iucv_sk(sk)->dst_user_id, 2186 nullstring, 8))) { 2187 iucv = iucv_sk(sk); 2188 break; 2189 } 2190 } else { 2191 if ((!memcmp(&iucv_sk(sk)->src_name, 2192 trans_hdr->destAppName, 8)) && 2193 (!memcmp(&iucv_sk(sk)->src_user_id, 2194 trans_hdr->destUserID, 8)) && 2195 (!memcmp(&iucv_sk(sk)->dst_name, 2196 trans_hdr->srcAppName, 8)) && 2197 (!memcmp(&iucv_sk(sk)->dst_user_id, 2198 trans_hdr->srcUserID, 8))) { 2199 iucv = iucv_sk(sk); 2200 break; 2201 } 2202 } 2203 } 2204 read_unlock(&iucv_sk_list.lock); 2205 if (!iucv) 2206 sk = NULL; 2207 2208 /* no sock 2209 how should we send with no sock 2210 1) send without sock no send rc checking? 2211 2) introduce default sock to handle this cases 2212 2213 SYN -> send SYN|ACK in good case, send SYN|FIN in bad case 2214 data -> send FIN 2215 SYN|ACK, SYN|FIN, FIN -> no action? */ 2216 2217 switch (trans_hdr->flags) { 2218 case AF_IUCV_FLAG_SYN: 2219 /* connect request */ 2220 err = afiucv_hs_callback_syn(sk, skb); 2221 break; 2222 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_ACK): 2223 /* connect request confirmed */ 2224 err = afiucv_hs_callback_synack(sk, skb); 2225 break; 2226 case (AF_IUCV_FLAG_SYN | AF_IUCV_FLAG_FIN): 2227 /* connect request refused */ 2228 err = afiucv_hs_callback_synfin(sk, skb); 2229 break; 2230 case (AF_IUCV_FLAG_FIN): 2231 /* close request */ 2232 err = afiucv_hs_callback_fin(sk, skb); 2233 break; 2234 case (AF_IUCV_FLAG_WIN): 2235 err = afiucv_hs_callback_win(sk, skb); 2236 if (skb->len == sizeof(struct af_iucv_trans_hdr)) { 2237 kfree_skb(skb); 2238 break; 2239 } 2240 /* fall through and receive non-zero length data */ 2241 case (AF_IUCV_FLAG_SHT): 2242 /* shutdown request */ 2243 /* fall through and receive zero length data */ 2244 case 0: 2245 /* plain data frame */ 2246 IUCV_SKB_CB(skb)->class = trans_hdr->iucv_hdr.class; 2247 err = afiucv_hs_callback_rx(sk, skb); 2248 break; 2249 default: 2250 kfree_skb(skb); 2251 } 2252 2253 return err; 2254 } 2255 2256 /** 2257 * afiucv_hs_callback_txnotify() - handle send notifcations from HiperSockets 2258 * transport 2259 **/ 2260 static void afiucv_hs_callback_txnotify(struct sk_buff *skb, 2261 enum iucv_tx_notify n) 2262 { 2263 struct sock *isk = skb->sk; 2264 struct sock *sk = NULL; 2265 struct iucv_sock *iucv = NULL; 2266 struct sk_buff_head *list; 2267 struct sk_buff *list_skb; 2268 struct sk_buff *nskb; 2269 unsigned long flags; 2270 2271 read_lock_irqsave(&iucv_sk_list.lock, flags); 2272 sk_for_each(sk, &iucv_sk_list.head) 2273 if (sk == isk) { 2274 iucv = iucv_sk(sk); 2275 break; 2276 } 2277 read_unlock_irqrestore(&iucv_sk_list.lock, flags); 2278 2279 if (!iucv || sock_flag(sk, SOCK_ZAPPED)) 2280 return; 2281 2282 list = &iucv->send_skb_q; 2283 spin_lock_irqsave(&list->lock, flags); 2284 skb_queue_walk_safe(list, list_skb, nskb) { 2285 if (skb_shinfo(list_skb) == skb_shinfo(skb)) { 2286 switch (n) { 2287 case TX_NOTIFY_OK: 2288 __skb_unlink(list_skb, list); 2289 kfree_skb(list_skb); 2290 iucv_sock_wake_msglim(sk); 2291 break; 2292 case TX_NOTIFY_PENDING: 2293 atomic_inc(&iucv->pendings); 2294 break; 2295 case TX_NOTIFY_DELAYED_OK: 2296 __skb_unlink(list_skb, list); 2297 atomic_dec(&iucv->pendings); 2298 if (atomic_read(&iucv->pendings) <= 0) 2299 iucv_sock_wake_msglim(sk); 2300 kfree_skb(list_skb); 2301 break; 2302 case TX_NOTIFY_UNREACHABLE: 2303 case TX_NOTIFY_DELAYED_UNREACHABLE: 2304 case TX_NOTIFY_TPQFULL: /* not yet used */ 2305 case TX_NOTIFY_GENERALERROR: 2306 case TX_NOTIFY_DELAYED_GENERALERROR: 2307 __skb_unlink(list_skb, list); 2308 kfree_skb(list_skb); 2309 if (sk->sk_state == IUCV_CONNECTED) { 2310 sk->sk_state = IUCV_DISCONN; 2311 sk->sk_state_change(sk); 2312 } 2313 break; 2314 } 2315 break; 2316 } 2317 } 2318 spin_unlock_irqrestore(&list->lock, flags); 2319 2320 if (sk->sk_state == IUCV_CLOSING) { 2321 if (skb_queue_empty(&iucv_sk(sk)->send_skb_q)) { 2322 sk->sk_state = IUCV_CLOSED; 2323 sk->sk_state_change(sk); 2324 } 2325 } 2326 2327 } 2328 2329 /* 2330 * afiucv_netdev_event: handle netdev notifier chain events 2331 */ 2332 static int afiucv_netdev_event(struct notifier_block *this, 2333 unsigned long event, void *ptr) 2334 { 2335 struct net_device *event_dev = netdev_notifier_info_to_dev(ptr); 2336 struct sock *sk; 2337 struct iucv_sock *iucv; 2338 2339 switch (event) { 2340 case NETDEV_REBOOT: 2341 case NETDEV_GOING_DOWN: 2342 sk_for_each(sk, &iucv_sk_list.head) { 2343 iucv = iucv_sk(sk); 2344 if ((iucv->hs_dev == event_dev) && 2345 (sk->sk_state == IUCV_CONNECTED)) { 2346 if (event == NETDEV_GOING_DOWN) 2347 iucv_send_ctrl(sk, AF_IUCV_FLAG_FIN); 2348 sk->sk_state = IUCV_DISCONN; 2349 sk->sk_state_change(sk); 2350 } 2351 } 2352 break; 2353 case NETDEV_DOWN: 2354 case NETDEV_UNREGISTER: 2355 default: 2356 break; 2357 } 2358 return NOTIFY_DONE; 2359 } 2360 2361 static struct notifier_block afiucv_netdev_notifier = { 2362 .notifier_call = afiucv_netdev_event, 2363 }; 2364 2365 static const struct proto_ops iucv_sock_ops = { 2366 .family = PF_IUCV, 2367 .owner = THIS_MODULE, 2368 .release = iucv_sock_release, 2369 .bind = iucv_sock_bind, 2370 .connect = iucv_sock_connect, 2371 .listen = iucv_sock_listen, 2372 .accept = iucv_sock_accept, 2373 .getname = iucv_sock_getname, 2374 .sendmsg = iucv_sock_sendmsg, 2375 .recvmsg = iucv_sock_recvmsg, 2376 .poll = iucv_sock_poll, 2377 .ioctl = sock_no_ioctl, 2378 .mmap = sock_no_mmap, 2379 .socketpair = sock_no_socketpair, 2380 .shutdown = iucv_sock_shutdown, 2381 .setsockopt = iucv_sock_setsockopt, 2382 .getsockopt = iucv_sock_getsockopt, 2383 }; 2384 2385 static const struct net_proto_family iucv_sock_family_ops = { 2386 .family = AF_IUCV, 2387 .owner = THIS_MODULE, 2388 .create = iucv_sock_create, 2389 }; 2390 2391 static struct packet_type iucv_packet_type = { 2392 .type = cpu_to_be16(ETH_P_AF_IUCV), 2393 .func = afiucv_hs_rcv, 2394 }; 2395 2396 static int afiucv_iucv_init(void) 2397 { 2398 int err; 2399 2400 err = pr_iucv->iucv_register(&af_iucv_handler, 0); 2401 if (err) 2402 goto out; 2403 /* establish dummy device */ 2404 af_iucv_driver.bus = pr_iucv->bus; 2405 err = driver_register(&af_iucv_driver); 2406 if (err) 2407 goto out_iucv; 2408 af_iucv_dev = kzalloc(sizeof(struct device), GFP_KERNEL); 2409 if (!af_iucv_dev) { 2410 err = -ENOMEM; 2411 goto out_driver; 2412 } 2413 dev_set_name(af_iucv_dev, "af_iucv"); 2414 af_iucv_dev->bus = pr_iucv->bus; 2415 af_iucv_dev->parent = pr_iucv->root; 2416 af_iucv_dev->release = (void (*)(struct device *))kfree; 2417 af_iucv_dev->driver = &af_iucv_driver; 2418 err = device_register(af_iucv_dev); 2419 if (err) 2420 goto out_iucv_dev; 2421 return 0; 2422 2423 out_iucv_dev: 2424 put_device(af_iucv_dev); 2425 out_driver: 2426 driver_unregister(&af_iucv_driver); 2427 out_iucv: 2428 pr_iucv->iucv_unregister(&af_iucv_handler, 0); 2429 out: 2430 return err; 2431 } 2432 2433 static int __init afiucv_init(void) 2434 { 2435 int err; 2436 2437 if (MACHINE_IS_VM) { 2438 cpcmd("QUERY USERID", iucv_userid, sizeof(iucv_userid), &err); 2439 if (unlikely(err)) { 2440 WARN_ON(err); 2441 err = -EPROTONOSUPPORT; 2442 goto out; 2443 } 2444 2445 pr_iucv = try_then_request_module(symbol_get(iucv_if), "iucv"); 2446 if (!pr_iucv) { 2447 printk(KERN_WARNING "iucv_if lookup failed\n"); 2448 memset(&iucv_userid, 0, sizeof(iucv_userid)); 2449 } 2450 } else { 2451 memset(&iucv_userid, 0, sizeof(iucv_userid)); 2452 pr_iucv = NULL; 2453 } 2454 2455 err = proto_register(&iucv_proto, 0); 2456 if (err) 2457 goto out; 2458 err = sock_register(&iucv_sock_family_ops); 2459 if (err) 2460 goto out_proto; 2461 2462 if (pr_iucv) { 2463 err = afiucv_iucv_init(); 2464 if (err) 2465 goto out_sock; 2466 } else 2467 register_netdevice_notifier(&afiucv_netdev_notifier); 2468 dev_add_pack(&iucv_packet_type); 2469 return 0; 2470 2471 out_sock: 2472 sock_unregister(PF_IUCV); 2473 out_proto: 2474 proto_unregister(&iucv_proto); 2475 out: 2476 if (pr_iucv) 2477 symbol_put(iucv_if); 2478 return err; 2479 } 2480 2481 static void __exit afiucv_exit(void) 2482 { 2483 if (pr_iucv) { 2484 device_unregister(af_iucv_dev); 2485 driver_unregister(&af_iucv_driver); 2486 pr_iucv->iucv_unregister(&af_iucv_handler, 0); 2487 symbol_put(iucv_if); 2488 } else 2489 unregister_netdevice_notifier(&afiucv_netdev_notifier); 2490 dev_remove_pack(&iucv_packet_type); 2491 sock_unregister(PF_IUCV); 2492 proto_unregister(&iucv_proto); 2493 } 2494 2495 module_init(afiucv_init); 2496 module_exit(afiucv_exit); 2497 2498 MODULE_AUTHOR("Jennifer Hunt <jenhunt@us.ibm.com>"); 2499 MODULE_DESCRIPTION("IUCV Sockets ver " VERSION); 2500 MODULE_VERSION(VERSION); 2501 MODULE_LICENSE("GPL"); 2502 MODULE_ALIAS_NETPROTO(PF_IUCV); 2503